Charging device for concrete-mixers.



E. W. BRACKBNBURY. CHARGINC DEVICE FCR CONCRETE MIXBRS.

OATION FILED JULY 2 4, 1912. RENEWED DBO. 15, 1913.

Patented Mar. 31

C M W a WIT/VESSES.'

B, W7 aM ATTUR/VEY JMW EDWARD W. BRACKENBURY, 0F

COMPANY,

" STATES;

MILWAUKEE, WISCONSIN, ASSIGNOR TO T. L. SMITH 0F MILWAUKEE, WISCONSIN.

CHARGING DEVICE FOR 'CONCRETE-MIXERS.

Specification of Letters Patent.

Patented Mar. 31, 1914.

Application lled July 24, 1912, Serial No. 711,280. Renewed December 15,1913. Serial No. 806,911.

To all 'whom it may conc-ern Be it known that I, EDWARD W. BURY, asubject of the King of England` ie siding at- Milwaukee, in the countyof Milwaukee and State `of Wisconsin, have invented a new and usefulCharging Device for Concrete-Mixers, of which the following is aspecification.

My' invention relates to Vimprovements in -charging devices for concretemixers of that type in which the charging bucket is hinged or pivoted ona stationary part of the 1nachine frame, and the objects tion are to soapply the power for actuating the charging bucket as to obviate needlessfriction and strains,thus reducing the work done in charging the mixerto its lowestlimit, and still provide a simple, durable and practicalmachine.

Another object'is to vary the leverage at which the power is applied inproportion to the work being done at different times in the cycle ofoperation of the machine without in anywise complicating the device.

I attain these objects by the mechanism illustrated in the accompanyingdrawing, in which:

Figure l is an'elevation of the complete concrete mixer and chargingdevice, and Fig. Q is an elevation of the charging bucket alone asviewed from Referring now to the details of the drawings, A is therotatably mounted mixer drum having the feed or charging opening`B andthe discharge opening C.V As the mixer may be of any usual constructionand forms no part of my present invention, it need not be particularlydescribed here.'

D is the supporting truck or skid frame on which the mixer is mountedand which also supports the hoisting shaft E. Two frames F are built onthe frame D, one at each side of the mixing drum, and the top shaft G iscarried by these frames. These frames F also carry the pivot shaft Hwhich is connected to the charging bucket I. Two quadrants K K areatt-ached to the charging bucket. one on each side thereof by means ofthe frame L. These quadrants are provided with grooves on theirperipheries adapted to contain ropes or other flexible connectors M, oneend of each of which is attached to one of the quadrants near the frameL, the other end of each being attached to one of the rope drums N onthe top shaft G. This top BRACKEN- of my inventhe lea hand of Fig. 1. l

l shaft also carries at one end a larger rope drum or sheave O, to whichis attached one y end of the rope I, the other end being attached to therope drum Q on the hoisting l shaft E. R, S and T are, respectively, afriction clutch, a brake, and a driving gear l on the hoisting shaft.

The material which is to be introduced to the mixing drum is placed inthe bottom end'of the charging bucket while in the position shown infull lines in Fig. l. As the friction clutch is thrown in, the shafts Eand G are actuated until the bucket I is tilted or swung from its fullline to its dotted line position shown in- Fig. l, when the materialcontained therein will slide along the scoop-like inclined side thereofinto the mixing drum A through the feed opening B.

It will be noted that as the device commences its cycle of operationthere is comparatively little lifting of the load, but more of ahorizontal movement thereof. As the movement continues, there is morelift-ing and less lateral movement of the load until, after a movementthrough 90 degrees, the work being done is the maximum, and thereafterdecreases until the position shown in dotted lines is reached. The workis, therefore, the lightest when the bucket starts on its excursion andthe moving parts are being accelerated. At all times after the first fewdegrees of movement the rope M is tangential to the quadrant K and ropedrum N and is, therefore, pulling to the best advantage on the pivotshaftI-I, and useless strain and friction on this pivot are' thusavoided.

In the design of the machine the radii of the three rope drums and thequadrant may be readily varied to suit the power available andthe speedof loading required. In order to increase the power by decreasing thespeed of the bucket at different parts of its excursion, the radius ofthe quadrant may be variable in length, as'shown by the dotted line K,Fig. 1. It is also to be noted that the less radial distance there isfrom the center of gravity of the load to the pivot shaft 4, the lessWill be the circumferentia distance through which the load must betically below the pivot and the radius of the load is, therefore, theleast possible for a given height of machine.

moved. In my device the buckethangs ver- `vsaid connector to pull What Iclaim is:

l. In a charging mixers, a charging bucket pivoted tothe machine fram'e,a hoisting device, a Wrapping connector attached to said bucket and tosaid hoisting device, and means causing on said bucket in asubstantially constant direction.

2. In a charging device for conc-rete mixers,a charging bucket pivotedto themachine frame, a sector attached to said bucket,

hoisting means for swinging said bucket into charging position, and aWrapping connector attached to and extending over the curved peripheryof said sector and attached to said hoisting means.

r 3. In a charging device for concrete device for concrete mixers, acharging bucket pivot-ed to the machine frame, a sector attached to saidbucket, hoisting means for swinging said bucket into ping connectorattached to and extending over the Icurved periphery of said sector andattached to said hoisting means, said sector having radii proportionedto the different lifting efforts requiredv at dierent positions of theload.

In testimony Whereoi-QI have hereunto signed my name in the presenceoftwo wit nesses.

i EDWARD W. BRACKENBURY. i IVitnesses:

A. E. EGGERT,

LILLIE SGHUMACHER.

charging position, and a Wrap`

